From 3aca6380fdf566e518640de0d90ea6fa74b41825 Mon Sep 17 00:00:00 2001
From: David Hildenbrand <david@redhat.com>
Date: Tue, 13 Apr 2021 11:55:22 +0200
Subject: [PATCH] virtio-mem: Don't report errors when
 ram_block_discard_range() fails

Any errors are unexpected and ram_block_discard_range() already properly
prints errors. Let's stop manually reporting errors.

Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Alex Williamson <alex.williamson@redhat.com>
Cc: Dr. David Alan Gilbert <dgilbert@redhat.com>
Cc: Igor Mammedov <imammedo@redhat.com>
Cc: Pankaj Gupta <pankaj.gupta.linux@gmail.com>
Cc: Peter Xu <peterx@redhat.com>
Cc: Auger Eric <eric.auger@redhat.com>
Cc: Wei Yang <richard.weiyang@linux.alibaba.com>
Cc: teawater <teawaterz@linux.alibaba.com>
Cc: Marek Kedzierski <mkedzier@redhat.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
Message-Id: <20210413095531.25603-5-david@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
---
 hw/virtio/virtio-mem.c | 20 ++++----------------
 1 file changed, 4 insertions(+), 16 deletions(-)

diff --git a/hw/virtio/virtio-mem.c b/hw/virtio/virtio-mem.c
index 3942fd7549..a92a067b28 100644
--- a/hw/virtio/virtio-mem.c
+++ b/hw/virtio/virtio-mem.c
@@ -246,17 +246,14 @@ static int virtio_mem_set_block_state(VirtIOMEM *vmem, uint64_t start_gpa,
                                       uint64_t size, bool plug)
 {
     const uint64_t offset = start_gpa - vmem->addr;
-    int ret;
+    RAMBlock *rb = vmem->memdev->mr.ram_block;
 
     if (virtio_mem_is_busy()) {
         return -EBUSY;
     }
 
     if (!plug) {
-        ret = ram_block_discard_range(vmem->memdev->mr.ram_block, offset, size);
-        if (ret) {
-            error_report("Unexpected error discarding RAM: %s",
-                         strerror(-ret));
+        if (ram_block_discard_range(rb, offset, size)) {
             return -EBUSY;
         }
     }
@@ -345,15 +342,12 @@ static void virtio_mem_resize_usable_region(VirtIOMEM *vmem,
 static int virtio_mem_unplug_all(VirtIOMEM *vmem)
 {
     RAMBlock *rb = vmem->memdev->mr.ram_block;
-    int ret;
 
     if (virtio_mem_is_busy()) {
         return -EBUSY;
     }
 
-    ret = ram_block_discard_range(rb, 0, qemu_ram_get_used_length(rb));
-    if (ret) {
-        error_report("Unexpected error discarding RAM: %s", strerror(-ret));
+    if (ram_block_discard_range(rb, 0, qemu_ram_get_used_length(rb))) {
         return -EBUSY;
     }
     bitmap_clear(vmem->bitmap, 0, vmem->bitmap_size);
@@ -625,14 +619,8 @@ static int virtio_mem_discard_range_cb(const VirtIOMEM *vmem, void *arg,
                                        uint64_t offset, uint64_t size)
 {
     RAMBlock *rb = vmem->memdev->mr.ram_block;
-    int ret;
 
-    ret = ram_block_discard_range(rb, offset, size);
-    if (ret) {
-        error_report("Unexpected error discarding RAM: %s", strerror(-ret));
-        return -EINVAL;
-    }
-    return 0;
+    return ram_block_discard_range(rb, offset, size) ? -EINVAL : 0;
 }
 
 static int virtio_mem_restore_unplugged(VirtIOMEM *vmem)